[crack a book] {v. phr.}, {slang} To open a book in […]

[crack a bottle] {v. phr.} To open a new bottle of […]

[crack a joke] {v. phr.}, {informal} To make a joke; tell […]

[crack a smile] {v. phr.}, {informal} To let a smile show […]

[crack down] {v. phr.}, {informal} To enforce laws or rules strictly; […]

[crack of dawn] {n. phr.} The time in the morning when […]

[crack the whip] {v. phr.}, {informal} To get obedience or cooperation […]

[crack up] {v.} 1. To wreck or be wrecked; smash up. […]

[cracked up] {adj. phr.}, {informal} Favorably described or presented; praised. - […]

[cracking] See: [GET CRACKING] - at [GET GOING] (2).